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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(TEXT_AUTOSIZING)
#include "TextAutosizer.h"
#include "Document.h"
#include "InspectorInstrumentation.h"
#include "RenderObject.h"
#include "RenderText.h"
#include "RenderView.h"
#include "Settings.h"
namespace WebCore {
TextAutosizer::TextAutosizer(Document* document)
: m_document(document)
{
}
TextAutosizer::~TextAutosizer()
{
}
bool TextAutosizer::processSubtree(RenderObject* layoutRoot)
{
// FIXME: Text Autosizing should only be enabled when m_document->page()->mainFrame()->view()->useFixedLayout()
// is true, but for now it's useful to ignore this so that it can be tested on desktop.
if (!m_document->settings() || !m_document->settings()->textAutosizingEnabled() || layoutRoot->view()->printing() || !m_document->page())
return false;
IntSize windowSize = m_document->settings()->textAutosizingWindowSizeOverride();
if (windowSize.isEmpty()) {
Frame* mainFrame = m_document->page()->mainFrame();
bool includeScrollbars = !InspectorInstrumentation::shouldApplyScreenWidthOverride(mainFrame);
windowSize = mainFrame->view()->visibleContentRect(includeScrollbars).size(); // FIXME: Check that this is always in logical (density-independent) pixels (see wkbug.com/87440).
}
for (RenderObject* descendant = traverseNext(layoutRoot, layoutRoot); descendant; descendant = traverseNext(descendant, layoutRoot)) {
if (!treatAsInline(descendant))
processBlock(toRenderBlock(descendant), windowSize);
}
return true;
}
void TextAutosizer::processBlock(RenderBlock* block, const IntSize& windowSize)
{
int windowLogicalWidth = block->isHorizontalWritingMode() ? windowSize.width() : windowSize.height();
float multiplier = static_cast<float>(block->logicalWidth()) / windowLogicalWidth; // FIXME: This is overly simplistic.
if (multiplier < 1)
return;
for (RenderObject* descendant = traverseNext(block, block, treatAsInline); descendant; descendant = traverseNext(descendant, block, treatAsInline)) {
if (descendant->isText())
processText(toRenderText(descendant), multiplier);
}
}
void TextAutosizer::processText(RenderText* text, float multiplier)
{
float specifiedSize = text->style()->fontDescription().specifiedSize();
float newSize = specifiedSize * multiplier; // FIXME: This is overly simplistic.
RefPtr<RenderStyle> style = RenderStyle::clone(text->style());
FontDescription fontDescription(style->fontDescription());
fontDescription.setComputedSize(newSize);
style->setFontDescription(fontDescription);
style->font().update(style->font().fontSelector());
text->setStyle(style.release());
// FIXME: Increase computed line height proportionately.
// FIXME: Increase list marker size proportionately.
}
bool TextAutosizer::treatAsInline(const RenderObject* renderer)
{
return !renderer->isRenderBlock() || renderer->isListItem() || renderer->isInlineBlockOrInlineTable();
}
// FIXME: Consider making this a method on RenderObject if it remains this generic.
RenderObject* TextAutosizer::traverseNext(RenderObject* current, const RenderObject* stayWithin, RenderObjectFilter filter)
{
for (RenderObject* child = current->firstChild(); child; child = child->nextSibling()) {
if (!filter || filter(child)) {
ASSERT(!stayWithin || child->isDescendantOf(stayWithin));
return child;
}
}
for (RenderObject* ancestor = current; ancestor; ancestor = ancestor->parent()) {
if (ancestor == stayWithin)
return 0;
for (RenderObject* sibling = ancestor->nextSibling(); sibling; sibling = sibling->nextSibling()) {
if (!filter || filter(sibling)) {
ASSERT(!stayWithin || sibling->isDescendantOf(stayWithin));
return sibling;
}
}
}
return 0;
}
} // namespace WebCore
#endif // ENABLE(TEXT_AUTOSIZING)
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